Key specifications
- Material
- Polyurethane (PU)
- Diameter range
- Ø 25 – 215 mm
- Standard sizes
- 20+
Selected size:
Product Description
Polyurethane back-up ring that prevents O-ring extrusion into the gap at high pressure. 20+ standard sizes available. For a quote, please send the size (ID × OD × height), material and quantity.
Technical Specifications
| Material | Polyurethane (PU) |
|---|---|
| Diameter range | Ø 25 – 215 mm |
| Standard sizes | 20+ |
Size Table
This product is available in 26 standard sizes. The table shows how they are distributed; use the size finder to see every size.
| Inner diameter d (mm) – range | Outer diameter D (mm) | Thickness T (mm) | Sizes |
|---|---|---|---|
| 20 – 30 | 30 | 1.25 | 1 |
| 30 – 50 | 48 | 1.25 | 1 |
| 50 – 80 | 55 – 82.55 | 1.25 – 3.18 | 7 |
| 80 – 120 | 85 – 125 | 1.25 – 1.9 | 10 |
| 120 – 200 | 127 – 180 | 1.27 – 2.75 | 5 |
| 200 – 300 | 220 – 230 | 2.75 | 2 |
🔎 Size finder
Applications
- Hydraulic and pneumatic cylinders, valves and pumps
- Static sealing of flanges, covers and fittings
- Gearboxes, transmissions and lubrication circuits
- Connection points on water, air and gas lines
Information Needed for a Quote
- Size (inner diameter × cross-section or connection size, mm/inch)
- Material and hardness (NBR, FKM, silicone, etc.)
- Quantity
- Operating conditions: fluid, temperature and pressure
Selection and Usage Notes
- Choose the material for the fluid and temperature: NBR for mineral oil, FKM for high temperatures and chemicals, silicone for food contact and wide temperature ranges.
- Use a harder compound or a back-up ring to prevent extrusion at high pressure.
- During fitting, keep seals away from sharp edges and threads and lubricate them with the system fluid.
Frequently Asked Questions
Can you supply sizes that are not listed?
Yes. For non-standard sizes and other materials, request a quote with the size and quantity.
Which material should I choose?
Send us the fluid, operating temperature and pressure, and our team will recommend a suitable material.
🔗 Share this product
Send the product page to your team or purchasing contact.
Other products in this group
← Back to group: O-Ring Back-up Rings
Sistemay Endüstriyel supplies O-Ring Back-up Rings products across Türkiye and abroad. For product selection, sizes, quantities and pricing, fill in the quote form or write to info@sistemay.com.